Window lock



Filzed Feb. 27, 1936 2 Sheets-Sheet 2 Patented Jan. 18, 1938 UNITED STATES PATENT OFFICE 1 Claim.

The present invention relates to new and useful improvements in window locks and has for its primary object to provide, in a manner as hereinafter set forth, coacting means on the meeting rails of the upper and lower sashes of windows through the medium of which said sashes may be automatically and positively locked in closed position.

Another very important object of the invention is to provide a window lock of the aforementioned character which may be conveniently released from the inside of the window when it is desired to raise or lower either or both of the sashes.

Other objects of the invention are to provide a window lock of the character described which will be comparatively simple in construction, strong, durable, highly eiicient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and whereinz- Figure 1 is a View in vertical section through the meeting rails of a pair of sashes, showing a lock constructed in accordance with the present invention installed thereon.

Figure 2 is a top plan view.

Figure 3 is a top plan view of the casing and locking levers with the top removed from said casing.

Figure 4 is a view in vertical transverse Section, taken substantially on the line 4--4 of Figure 2.

Figure 5 is a detail view in perspective of one of the pivoted locking levers.

Figure 6 is a detail view in front elevation of the locking plate.

Referring now to the drawings in detail, it will be seen that the numerals I and 2 designate the meeting rails of the lower and upper window sashes 3 .and 4, respectively. The reference numeral 5 designates a window frame of conventional construction in which the sashes 3 and 4 are mounted for vertical sliding movement.

Rigidly mounted on the rail 2 of the upper sash 4 is a vertical plate E having a pointed upper end and further having acute angled notches or recesses formed therein in a manner to provide a head 8. The notches each have corresponding horizontal edges 'I and inclined edges la. The plate 6 includes an apertured base 9 through which screws I are inserted for securing said plate 6 in position on the rail 2.

Rigidly secured, as by screws I I, on the rail I of the lower sash 3 is a metallic casing I2 which includes a removable top or cover portion I3. The casing has a bottom wall I3a, front and rear end walls, I2a and I2b respectively, and opposite side walls I2C rising therefrom. Mounted vertically in the substantially closed chamber 2I of the casing I 2 are spaced pins or the like I4 on which locking levers I are journaled at an intermediate point for swinging movement in a horizontal plane. The end portions of the levers I5 project beyond the casing I2, as illustrated to advantage in Figure 3 of the drawings. One end portion of the levers I5 projects over the rail 2 of the upper sash l for engagement in the notches of the plate 6 beneath the head 8. The opposed sides of these end portions of the levers I5 are undercut, as at I6, to facilitate spreading 0f said levers when they engage on the pointed head 8 of the plate 6 and ride downwardly thereon just prior to snapping into the notches. The undercut portions I6 of the levers are of right triangular cross-sections the sides of the angle between the altitude and hypothenus of which conforms to the angular notches. The other end portions of the levers I5 are formed to provide handles I'I which are adapted to be pressed together against the tension of a coil spring I8 in the casing I2 for disengaging said levers from the notches thereby unlocking the sashes 3 and 4. The front and rear walls of the casing I2 are recessed respectively as at |811; and Ib (see Figure 3) to accommodate the projecting end portions of the levers I5.

It is believed that the many advantages of a window lock constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:-

A lock for attachment to the meeting rails of window sashes and comprising a keeper plate on one rail having an upstanding keeper lug provided wth a Wedge shaped upper end and a pair of opposed notches in the side edges thereof, respectively, each of acute angled form, and a pair of opposed laterally spaced locking levers pivotally mounted intermediate their ends on the other rail and having corresponding ends extending from said rail upon opposite sides of said lug, respectively, to receive the latter therebetween, said ends conforming in cross sectional contour to that of said notches, and said levers being tensioned to urge said ends thereof together to be cammed apart by said wedge shaped head.

LEO DZ'UKALO. 

